In Windows desktop Chrome AURA the HandleVisibilityChanged function on the HWNDMessageHandlerDelega…

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
===================================================================
--- ui/views/widget/desktop_aura/desktop_root_window_host_win.cc	(revision 195576)
+++ ui/views/widget/desktop_aura/desktop_root_window_host_win.cc	(working copy)
@@ -383,6 +383,18 @@
 void DesktopRootWindowHostWin::OnNativeWidgetBlur() {
 }
 
+void DesktopRootWindowHostWin::SetInactiveRenderingDisabled(
+    bool disable_inactive) {
+  // We call DefWindowProc of WM_NCACTIVATE to paint the caption as active or
+  // inactive. This is safe with the only sideeffect being the
+  // WM_GETTEXT message which is sent by DefWindowProc to get the text to be
+  // displayed on the caption.
+  ::DefWindowProc(message_handler_->hwnd(),
+                  WM_NCACTIVATE,
+                  !!disable_inactive,
+                  0);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostWin, RootWindowHost implementation: